Arena Service Manual
“B” conductivity probe, the supply pressure pump, and the supply
pressure regulator. Figure 4-7 describes this loop.
The loop configuration helps to mix the bicarbonate concentrate by
recirculating the solution through the “B” mix chamber. The loop
also acts as a conduit for flow that is diverted by the supply
pressure regulator at the end of each flow equalizer fill cycle.
Figure 4-7. Supply Pump Recirculation Loop
4.2.10.1 "B" Mix Point
Bicarbonate concentrate enters the water-acid concentrate mixture
at the “B” mix point.
4.2.10.2 "B" Mix Chamber
During hemodialysis therapy, the solution that enters the “B” mix
chamber from the supply manifold contains water and acetate
concentrate, or water and the acid and bicarbonate components of
bicarbonate dialysate (depending on the concentrates selected).
This chamber mixes the solution before it is monitored by the “B”
conductivity probe.
4.2.10.3 "B" Conductivity Probe/Thermistor Set
This is one of three conductivity probe sets. The other two are
described in Section 4.2.7.4, "A" Conductivity Probe/Thermistor
Set, and Section 4.2.13.1, Dialysate (Primary) Conductivity
Probe/Thermistor Set.
4-10 157-1278-893 Rev A
January 2004
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